Sprint announced on Thursday that the HTC EVO 4G will receive an over-the-air update to Android 2.3 (Gingerbread) on June 6th. Android 2.3 will reactivate the ability to sync multiple Gmail accounts on the EVO 4G, and will also improve download management and streaming media applications, among other changes. Want the update sooner? Here’s a little secret: you can download the update and install it manually beginning on June 3rd. Simply navigate to your phone’s settings menu, choose “system updates,” and then select “HTC software update.”